I have the same problem, but with my wife. Sex was normally three times a week, but after we got married it dropped to 1 time a week. Two years later I'm lucky if I get it once a month. When I explain to her how important sex is to me, she accuses me of only wanting her for sex. I never cheated on her and I never planned on doing that to her. I am very attractive to my wife and I don't know what to do.
Honestly, I'm lost. I consider myself to be fairly attractive. I'm 5'11 tall and with some muscle definition. I can last hours during intercourse and I have a larger than average penis. I'm not trying to gloat or anything, I'm just lost and confuse. I try everything I can. I walk around in my underwear, I work out in front of her, and I lift weights in front of her. I tell her how pretty she is and how attractive she looks and I get nothing out of it. I always make sure she finishes when we do have sex and I always do most of the work during sex. I go down on her and I four play with her. I'm tired of hearing her tell me that she is too tired for sex or telling me that she will have sex with me on a particular night and then getting the cold shoulder when I approach her for sex.